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• Right choice to play audio and video content

  22 juin 2012, par deimus

  What I'm doing :

  I need to play audio and video files that are not supported by Apple on iPhone/iPad for example mkv/mka files which my contain several audio channels.

  I'm using libffmpeg to find audio and video streams in media file.
  Video is being decoded with avcodec_decode_video2 and audio with avcodec_decode_audio3
  the return values are following for each function are following

  • avcodec_decode_video2 - returns AVFrame structure which encapsulates information about the video video frame from the pakcage, specifically is has data field which is a pointer to the picture/channel planes.
  • avcodec_decode_audio3 - returns samples of type int16_t * which I guess is the raw audio data

  So basically I've done all this and successfully decoding the media content.

  What I have to do :
  I've to play the audio and video accordingly using Apples services. The playback I need to perform should support mixing of audio channels while playing video, i.e. let say mkv file contains two audio channel and a video channel. So I would like to know which service will be the appropriate choice for me ? My research showed that AudioQueue service might be useful audio playback, and probably AVFoundation for video.

  Please help to find the right technology for my case i.e. video playeback + audio playback with possible audio channel mixing.

• How can I use FFMPEG to fix a mpeg.ts file

  29 septembre 2017, par Tim McClure

  I have an mpegts file that has some minor quality issues. Can I use ffmpeg to create an mp4 file from it and the mp4 file plays fine - meaning the transmuxing to mp4 corrected the problem. I am trying to use ffmpeg to re-encode the mpegts file to another mpegts file and through the transmuxing have the video file fixed. The script I am using :

  ffmpeg -re -i 20170925T214300_S051-0001.ts -pix_fmt yuv420p -vcodec libx264 -r 25 -vf "scale=1024:576" -threads 0 -b:v: 2048k -bufsize 2244k -maxrate 2560k -profile:v baseline -g 50 -x264opts no-scenecut -x264opts force-cfr -an -f mpegts mcclure.ts

  Is what I am trying to do possible ?

• FFmpeg : how to make video out of slides and audio

  17 juillet 2014, par Muhammad Umer

  So i have several images some png and some jpgs. And i have mp3 audio. I want to make a video file don’t care what format.

  So i want either :

  A video made up of xyz size meaning images are centered and cropped if they go beyond dimensions coupled with audio in mp3 format..

  or just one image centered or and cropped, still image, video with audio.

  I have tried copying and pasting things and even modifying them after reading documents but in the end i got a blank video with audio and huge file that took forever to complete.

  I have windows 7.